Abstract: A buckle-folding unit for a folding machine has at least one buckle plate (10) including a plurality of plate-bar structures (12) which are spaced apart one beside the other in a single plane, each of the plate-bar structures (12) including two plate bars (14, 16) spaced apart from one another to form a gap (18) therebetween, the gaps (18) being located in a single plane. The plate bars (14, 16) have an inner recess (33) in the side thereof which is directed toward the gap (18). A sheet-stopping device (22), which can be displaced in the longitudinal direction of the plate-bar structures (12), is arranged transversely to the plate-bar structures (12) and passes through the gaps (18) of the plate-bar structures (12).